Quote:
Originally Posted by Lapkritis
I have a good picture to upload from my slr later tonight of this stud. You can see in the cell phone picture above what I'm going to point out in the SLR picture that shows it much more clearly. The body of the stud has striations in the same manner as the cardboard core of a roll of paper towels or tp...to me this is an obvious indicator of a tooling flaw during the manufacturing process as they roll out the stock. These striations are the same angle as the break. The tool must have had a bur that was imprinted on the body of the stud top to bottom circling around about 1cm at about 30 degrees... definitely a sign of piss-poor quality control.
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Yup, a stress riser will do that. They'll all break eventually.
Good news though. When you get the engine apart, be sure to check all the studs for signs of them pulling out of the case. There's never any guarantee that they weren't in the process of pulling when the stud broke.